Outliers¶
In statistics, outliers are data points that don’t belong to a certain population. It is an abnormal observation that lies far away from other values. An outlier is an observation that diverges from otherwise well-structured data.
For Example, you can clearly see the outlier in this list: [20,24,22,19,29,18,4300,30,18]
Types of Outliers¶
Univariate
Univariate can be found when we looking at a distribution of values in single feature space
multivariate
multivariate outlier can be found in n dimensional space
Different flavours of outliers¶
Point (Single Data point Outlier)
Contextual (Noise in data)
Collective (subset of novelties in data)